Background
The vaccination immune response may induced false-positive 18F-FDG PET/CT uptake.
Case presentation
An extended supraclavicular lymph nodal activation after Coronavirus Disease 2019 (Covid-19) vaccination revealed on 18F-FDG PET/CT mimics a Virchow nodule in a patient with medical history of well-differentiated appendicular adenocarcinoma.
Conclusion
This case highlights a nodal activation beyond axillary area and the importance of documenting vaccination history at the time of scanning to avoid false-positive results.